American Cars
Headlights Tail and Brake Lights
Jeep Grand Cherokee Limited
Ford Expedition Eddie Bauer

Why does one brake light work and the other brake light does not work?



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One possibility is, on multi-light tail light assemblies, is a burned out bulb. Some cars have separate light bulbs for tail, brake, turn, and backup lights

The other possibility is an electrical short in the wiring. Somewhere in the miles of wires, two wires have crossed or the insulation has worn off and is shorting to the chassis. The only cure is to trace out each individual wire with a voltage meter.